Clutch-pulley



(No Model.)

0. E. BURWELL.

OLUTGHPULLEY.

Patented Dec. 3, 1889.

nyhur. wnmnmn. n. a

U ITED STATES PATENT OFFI E.

CHARLES E. BURWELL, 0F SPRINGFIELD, MASSACHUSETTS.

CLUTCH -PULLEY.

SPECIFICATION forming part of Letters Patent No. 416,562, dated December a, 1889.

' Application filed August 29, 1889- Serial No. 322,381- (No model.)

To all whom it mag concern.- Be it known that 1, CHARLES E. BURWELL, a citizen of the United States, residing at Springfield, in the county of Hampden and State of Massachusetts, have invented new and useful Improvements in Clutch-Pulleys, of which the following is a specification.

This invention relates to clutch-pulleys, the object being to provide an improved friction and positive clutch-pulley combined; and the invention consists in the peculiar construction and arrangement of the various parts of the pulley, all as hereinafter fully described, and pointed out in the claims.

In the drawings forming part of this specification, Figure 1 is a longitudinal section of a combinedifriction and positive-acting clutchpulley embodying my improvements, a part of a shaft on which the parts of said pulley are mounted being shown in this figure, and showing the positions of said parts when not in frictional or other engagement. Fig. 2 is a similar View to Fig. 1, but showing the parts of the device in the positions occupied when they are in frictional and positive engagement. Fig. 3 is a transverse section about on line 3 3, Fig. 1. Fig. 4 is a perspective view illustrating the friction-ring, its operatingwedge, and a portion of the operating-lever. Fig. 5 is a pers )ective view of a portion of the driving pu ley, showing the construction of its friction-hub.

In the drawings, A represent-s the shaft, and B a loose pulley on the same, the hub a, which is at one side of thispulley, projecting within an open-ended cylindrical shell 1), forming part of the carrier-hub C, which is affixed to and turns as one with the shaft. The said hub a of the pulley B intermediate of its axial length is provided with a peripheral groove d, from the bottom of which oil-ducts 6 lead inwardly to the inner periphery of the hub, which fits the shaft A.

The internal diameter of the shell portion 1) of the hub O is somewhat greater than the diameter of the hub a, and in. the intermediate annular space is placed a spring friction clutching ring or strap D, which is a ring severed, as at c, in one point of its circular length, and said ring near and at each side of its severing-line is provided with apertures f f, the walls f of both, which are nearest each other, being inclined as shown particularly in Figsb and 4:.

Pivotally mounted and supported in earpieces on the hub-shell b is a lever E, 011 the short arm 9 of which is anadjustable bearing-abutment h in the form of a screw, Which by its inner end rests upon the outer end of a block 'F of cylindrical form, that has its inner end bifurcated, as at i, the inner side of each leg inclining downwardly and outwardly and projecting through an aperture j in thehub-shell, and also into the apertures ff in the spring clutching-ring, inward movement on the said bifurcated block securing a contraction of the ring Dabout the pulley- "hub a.

G represents a sleeve, which is supported and adapted to slide on the shaft A, actuated by a shipping-lever II, as common, the end portion is ofv said sleeve toward the pulley B being inclined or of conical form and the movement of said sleeve toward and from the pulley, operating 011 the long arm of the lever E, actuates said lever, and through it the clutching-ring. The sleeve parallel with its axis is provided with a bore of two diameters, as at Z and Z, a rest or shoulderbeing formed, as at m, and a pin J is disposed in said bore, normally projected forward by a spiral spring at, which is confined in the larger bore Z by the screw-plug 0, the forward projection of said pin being limited by its head coming to bear on the rest m. The carrier-hub C has a socket-bore 19 through it from end to end parallel with its axis, and at the same distance from the axis of the shaft as the axis of the spring-pressed pin J, and the pulley-hub a also has a socket'bore q therein, also at the same distance from the axis of the shaft as is the said bore p and pin J.

Assuming that the sleeve is moved to its position farthest from the pulley B and the spring-pressed pin is in its extended position, as shown in Fig. 1, the outer end of the lever being nearer the axial line of the shaft, the abutment on the inner end of said lever per mitting the bifurcated double wedge-block to move outwardly and the spring clutchingring to expand and be free from engagement with the pulley-hub, whereby said pulley may be free to rot-ate. On now forcing the sleeve toward the pulley B a gradually-increasing friction through the operation of the parts just enumerated is caused between the ring I) and the periphery of the hub (t, and the pin J, not turning, its sleeve being then free from rotation 011 the shaft and its end being in contact with the end face of the carrierhub, is under the sliding movement of the sleeve forced into the bore Z Z of the sleeve, where it remains during a part of a rotation and until the axes of both the said pin and the soeket-hole p in the carrier-hub G are coincident, when the said pin by its spring will be project-ed into said socket-bore, a locking engagement between the sleeve and carrierhub resulting, and the sleeve will then turn with the shaft. At the time of the entrance of the pin into the bore 12 of the earrierhub the bore ot the pulley-hub will. probably not be coincident therewith, and the pin will then bear on the end face of said pulley-hub; but it, under the power in transmission, there should be any slipping of the clutching-ring over the carrier-huba as soon as the said pin J, which is lying within the bore of the carrier-hub, should come into axial coincidence with the bore q of the pulley-hub said pin will be further projected and made to enter into said here q, and in addition to the frictional engagement of the clutching ring (which is movable with the carrier-hub C through the medium of the bifurcated block) with the pulley-hub a positive locking engagement between the carrier-hub and the pulley-hub is established, and, as is plain, on sliding the sleeve G away from the pulley the positive locking engagement will be broken and the ring or strap released from its engagement for the frictionalclutching action between the carrier and pulley-hubs.

It will be noticed on reference to Figs. 1,

3, and -i that the shell I) of the carrier-hub and also the clutching-ring I) are each provided with a hole 0' and s, respectively, opposite eaeh other and also opposite the peripheral groove (Z in the hub a, from which groove the oil-ducts lead to the periphery of the shaft. Said holes '7' and s, the groove (Z, and the ducts c afford a most convenient and practical means for introducing oil to the bearing between the pulley and the shaft, for it will be plain that the oil when introduced into the aperture 7' will also pass through the aperture .9 in the clutching-ring, and, passing into the annular groove (1 in the pulley-hub, will be conducted thereby to the radial ducts c and thence to the shaft.

\Vhat I claim as my invention is 1. In combination, the shaft having thereon the hub-shell I), provided with the aperture 9', the pulley provided withithe huh (I, within said shell and having the peripheral groove (Z, and one or more ducts a, leading therefrom to the inner periphery of the hub, the friction clutching ring or strap having the aperture .9 therein, and a means forinsnrin g a contraction and expansion of said ring about said pulley-hub, substantially as and for the purpose described.

2. In a clutch device, in combination, the shaft having thereon the hub 0, provided with the longitudinal bore 1), the pulley provided with the hub provided with the longitudinal bore q, a friction clutching-ring about said hub, and means for operating said ring, and a sliding sleeve having therein a longitudinal bore, and a spring-pressed pin .l', playing in said sleevebore, substantially as and for the purpose described.

CHARLES 1*]. BURVVELL. \Vitn esses:

WM. BELmnvs, J. 1). GARFIELD. 

